Machine for folding paper bags



Dec. 9, 1924. 1 1,518,192

P. GANGLER MACHINE FOR FOLDING PAPER BAGS Fild May 15, 1922 1 2 Sheets-Sheet 1 Jig-Z.

Paul @ny'iez" Dec. '9, 2 1,518,192

' P. GANGLER MACHINE FOR FOLDING PAPER BAGS Filed May 5, 1922 2 Sheets-Sheet 2 Attorney Patented Dec. 9, 1924.

UNITED STATES PAUL GANGLER, OF ESSLIN'GEN, GERMANY.

MACHINE FOR FOLDING PAPER BAGS.

Application fil ed May 15, 1922. Serial No. 561,037.

To all whom it may concern:

Be it known that I, PAUL GANGLER, a citi- Zen of the Republic of VVurttemberg,resid1ng at 53 Panoramastrasse, Esslingen, Germany,

5 have invented certain new and useful Improvements in a Machlne for Folding Paper Bags, of which the following 1s a specification.

My invention relates to a new or improved j device for folding or flattening open bags tion with reference to the accompanying drawings, which illustrate one construction of the device by way of example.

In the drawings:

Fig. 1 is a side-elevation,

Fig. 2 is a sectional elevation of the rear portion of the device viewed from the line AB, Fig. 1, some parts being omitted for the sake of clearness.

Fig. 3 is a corresponding elevation Viewed from the line A-B, Fig. 1, towards the front part of the device.

Fig. 4 is a diagrammatic illustration of the operation of the device, and 7 Figs. 5 and 6 show a bag folded by the device.

In the illustrated construction, the folding apparatus consists essentially of a bottom or bed plate 44, a cover or top plate 23,

disposed at the sides of the bottom plate. The two side plates 1 and 2 may be turned or folded against the bottom plate in any suitable manner, preferably in the manner the height of the sides of the bag P to be creased by them, and taper towards the end 100 at the bottom part of the bag to be folded, so that during their inward motion they produce the creases or folds indicated in broken lines in Fig. 1, into which the bag must be folded.

In the example illustrated, the angular movement of the folding plates 1 and 2 is effected by the aid of shafts 5 and 6, rotatably mounted in bearings 7 and 8, which are fixed on brackets 9 and 10 of standards 11 and 12 mounted upon the machine plate 101. The shafts 5 and 6 are with the exception of the portions contained within the bearings 7 and two side folders or creasers 1 and 2 described hereafter. They are of about half and 8, recessed along their entire length to form quadrants 3 and 4, and on these quadrants 3 and 4 are mounted the folding flaps 1 and 2 by the aid of counter plates 102 and 103. Upon the outer ends of the shafts 5 and 6 are keyed spur wheels 13 and 14 which gear with spur wheels 15 and 16, which in their turn mesh with each other, as particu larly clearly shown in Fig. 2. The spur wheels 15 and 16 are adapted to turn on bolts 1.04 and 105, which are secured in slots 120 and 121 of holders 106 and 107 of the brackets 9 and 10, the said holders being connected with each other by a cover plate 108. With the spur wheel 15 gears the toothed portion 109 of a'bar 17, which is adapted to be moved up and down in a guide 21 mounted upon the bracket 9, and is operated by the means of a link 18, of a bell-crank lever 19 fulcrumed at 119 by means of an appropriately shaped excentric or cam upon the main shaft 110, against which cam or excentric the antifriction roller 300 of the lever 19 is pressed by the spring 20. s

This construction enables the side plates 1 and 2 to adapt themselves to various sizes of bags. For this purpose, the folding plates 1 and 2 are exchanged by folding plates of the appropriate size, and the shafts 5 and 6 are moved closer together or further apart by displacing their bearings 7 and 8 on the flanges 9 and 10 in order to decrease or in crease the distance between the folding plates 1 and 2. The engagement of the spur wheels 15 and 16 with the spur wheels 13 and 14 is maintained by adjusting the bolts 104 and 105 either higher or lower in the slots 120, 121.

The cover plate 23 is movable relative to the bottom plate 44 and is likewise exchangeable on v the holder 24 in accordance with the sizeof the bag to be folded. This holder 24 is mounted upon a rod or bar 15, which is vertically guided in a standard 26 mounted on the bed plate 101 of the machine. The said rod or bar 15 is vertically reciprocated by a bell-crank lever 27 fulcrumed upon a shaft 127 mounted upon the bed plate 101 of the machine, by the aid of a connecting rod 39 and bell-crank 40 from an excentric upon the main or first motion shaft 110, with which excentric the antifriction roller 303 of the lever 40 is kept in contact. In order to prevent a lateral movement of the cover plate 23, the holder 24 is furnished with a second guide bolt 131, which is vertically guided in an extension 132 upon the standard 26.

The tapered rear end of the cover plate 23 terminates above the, creases 140 to be produced in the sides of the bag P.

At the front end of the cover plate 23, a gripping plate 31 is fulcrumed, which is adapted to fit into a corresponding recess 141 of the cover plate 23. The grip plate is fixed upon a bar 305 by means of a bent limb. The bar 305 is fixed upon apin 307 fulcrumed in eyes 200, 201 of the plate 23. Upon the pin 307 is mounted an arm 32 with a roller .33, which is adapted to glide in a slotted guide 34. This latter guide is fixed upon a rail 35 by means of a lateral eX- tension 34. The rail 35 is reciprocated horizontally in a guide 36 upon the standard 26 by means of a bell-crank lever 37 fulcrumed upon the bolt 127, the said bell-crank 37 being oscillated by the arm 38 in a suitable manner from an eXcentric upon the main or first motion shaft 110.

The bed or bottom plate 44 is exchangeably attached to a rail 45, so that it may be adapted to the size ofthe bag. The rail 45 is guided horizontally in a slide 205 mounted on a pillar 46 and is moved to and fro by abell-crank lever 47 fulcrumed at 147 on the bed plate of the machine, and operated by an excentric 48 on the main shaft 110, with which the roller 308 is kept in contact by means of the spring 49. At the front edge of the plate 44, there is also a. gripping plate 50, which is shown in the closed position, and is mounted upon a bar 250, which is supported upon a pin 251, rotatably mounted in eyes 252, 253 of the plate 44, and upon which an arm 51 with a roller 52 is attached, which roller is guided in a horizontal slot 53. The slot guide 53 is by means of the pillar 254 fixed upon a rail 54, which is vertically guided in a standard 255 mounted upon the machine plate 101, and is reciprocated by a bell-crank 55, fulcrumed upon the shaft 127, which bell-crank receives motion through the link 56 from a bell-crank 57 fulcrumed upon the shaft 157, which bellcrank is operated by an excentric 58 upon the shaft 110 with which the roller 310 is kept in contact by the spring 59.

' At the rear end of the folding device is fixed a stationary abutment 260, preferably provided with a cushion 60 of india-rubber or some other resilient material, which may be inserted into a dove-tailed groove 261 in thestandards 11 and 12.

The device operates in the following manner:

The bag to be folded is introduced into the described folding apparatus by a suitable feeding device or similar appliance, until the bottom of the bag rests against the top plate or the abutment 60, whereupon. the

grippers 31 and 50 by a movement of the rail 35 towards the left and a downward movement of the rail 54 are swung towards the inside and clamp the upper and lower edges of the bag I in the recesses 14;] and 270, Now the side plates 1 and 2 are swung in wards. in the manner shown in. Fig. 4. by means of the spur-wheel gearing descril'ied, and simultaneously the cover plate 23 moved towards the bottom plate 44 by the aid of the rod 15, until the plates 44, 23, 1. 2 compress between them the creased and flattened out bag. As the upper and the rear edge of the side plates 1 and 2 conform with the outline of the bend or tuck to be produced in the sides of the bag. the sides of ihe bag are correspondingly creased inwards and folded, when the plates 1 and 2 n'iove inwards and the top plate downwards. while the upper half of the bottom moves forward, upon the flattened rear end of the top plate 23. The bag is now folded ready for use, as shown in Figs. 5 and 6.

Now the side flaps or wings 1 and 2 and the top plate 23 are slightly withdrawn,

where-upon the gripper 31 releases the upper edge of the bag, and the bottom plate fl is moved towards the rear by a movement to the right of the rail 45, until the rear end o f the folded bag comes between the rollers (ll and 62. As particularly clearly shown in Fig. 2, both rollers consist of individual rings or discs, so that the bars 3 and l.- as well as the rear portion of the plate 4-!- may pass through between them, the said rear portion of the plate 44 being recessed in correspondence with the rings of the roller (11, so that the fingers remaining in the plate it may pass between the rollers 61 and 2 and the rear end of the folded bag is safely guided between the delivery rollers (31. and 62. Of these rollers, the lower one 61 is rotated by the chain wheel 63 eyed on its shaft and driven by a chain gear, not shown in the drawing, from the shaft 110, while the upper roller 62 is driven by SPlllWllLQl gearing, not shown, from the lower roller (Bl. As soon as the rear edge of the bottom of the bag has been nipped between the rollers (31 and 62, the gripper 50 releases the lower edge of the bag, and the bottom plate 44 is by the movement to the left of the rail 45 again returned into its starting position, shown in Fig. 1, whereupon. the next bag to be folded may be introduced into the device.

It will be readily understood, that I do not confine myself to the details of the construction described and illustrated by way of example only, and which may be varied within wide limits without departing from the spirit of my invention or sacrificing any of its advantages.

I claim:

1. Machine for folding paper bags of angular cross-section comprising in combination, a bottom plate serving to support the bag to be folded, a shaft extending along either side of said plate, a folding plate removably secured to each shaft and adapted to be folded down upon said plate, a top plate adapted to be moved towards and way from said bottom plate, supports for said plates, means for exchangeably fastening said plates to said supports and means for varying the distance between said shafts.

2. Machine for folding paper bags of angular cross-section comprising in combi nation, a bottom plate serving to support the bag to be folded, a standard on either side of said plate, a bracket secured to each standard, a bearing mounted on each bracket for horizontal displacement, a shaft supported in each bearing and extending along one side of said plate, a folding plate removably secured to each shaft and adapted to be folded down upon said plate, a top plate adapted to be moved towards and away from said bottom plate, supports for said plates and means for exchangeably fastening said plates to said supports.

3, Machine for folding paper bags of angular cross-section comprising in combination, a bottom plate serving to support the bag to be folded, a standard on either side of said plate, a bracket secured to each standard, a bearing mounted on each bracket for horizontal displacement, a shaft supported on each bearing and extending along one side of said plate, a spur wheel on each shaft, a pair of gear wheels meshing with one another and with said spur wheels, slotted holders near said gear wheels, journals carrying said gear wheels and displaceably mounted in said slotted holders, a folding plate removably secured to each shaft and adapted to be folded down upon said plate, a top plate adapted to be moved towards and away from said bottom plate, supports for said plates and means for exchangeably fastening said plates to said supports.

4. Machine for folding paper bags of angular cross-section comprising in combination, a bottom plate serving to support the bag to be folded, and capable of horizontal movement, a shaft extending along either side of said plate, a folding plate removably secured to each shaft and adapted to be folded down upon said plate, a top plate adapted to be moved towards and away from said bottom plate, supports for said plates, means for exchangeably fastening said plates to said supports, means for varying the distance between said shafts and a pair of delivery rollers in the path of said bottom plate.

5. Machine for folding paper bags of angular cross-section comprising in combina tion, a bottom plate serving to support the bag to be folded, a shaft extending along either side of said plate, a folding plate removably secured to each shaft and adapted to be folded down upon said plate, a top plate adapted to be moved towards and away from said bottom plate, supports for said plates, means for exchangeably fastening said plates to said suports, means for Varying the distance between said shafts, a gripping plate disposed at the front edge of said bottom plate, a horizontally slotted guide aside of said plate and an arm supporting said gripping plate and operatively connected with said guide.

In testimony whereof I affix my signature in presence of two witnesses.

PAUL GANGLER. 1 s.]

[L. s.] [1,. s.] 

